Electronic heat-treating device



Oct. 27, 1953 Filed Sept. 8, 1948 H. F'. K INCAID EI'AI..l

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Patented Oct. 27, 1953 UNITED STATES PATENT CFFICE ELECTRONIC HEAT-TREATING DEVICE Application September 8, 1948, Serial No. 48,296

12 Claims.

This invention relates to an apparatus for heat treating metal articles. More particularly, this invention relates to an apparatus that is automatically operable to subject a plurality of metal articles to a complete heat treating cycle for the purpose of producing a hardened surface on the article treated.

The speed with which metal articles are heat treated by induction is well-known to those familiar with the art. In the treatment of articles having irregular contours such as gears, racks and sprockets, it is desirable to subject the articles to certain deiinite novel treating processes in order to secure an elicient article having a surface zone hardened to a predetermined hardness. Such a process is clearly set forth in the I-I. F. Kincaid et al. Patent No. 2,564,906 entitled "Heat Treatment of Irregular Objects, patented August 21, 1951. In a process of the type disclosed in the aforementioned application a number of heating and quenching stations are provided and the article to be treated is subjected to a certain operation at each station. It can readily be appreciated that in a process of this type the time factor is of great importance and it is therefore desirable to provide an apparatus that will deliver the articles to 4the station promptly and uniformly so that a uniform hardened article will result. It is applicants prime object, therefore, to provide a novel heat treating apparatus that is effective to heat treat an article in an efcient and uniform manner.

Another object is to provide a heat treating apparatus including a plurality of treating stations, and a handling mechanism for delivering articles to the stations, said handling mechanism being arranged to continually deliver articles to the heat treating station, said handling mechanism including means for ejecting the articles after they have been treated.

A specific object is to provide an apparatus including a plurality of heat treating stations, said apparatus includingr an endless conveyor arranged to move articles to be treated adjacent to a plurality of heat treating stations, said conveyor including a mechanism for moving each article to be treated successively into an electromagnetic eld produced at each station.

A further specic object is to provide a heat treating mechanism including a plurality of heat treating stations, each station including an inductor ring, a mechanism for simultaneously delivering a plurality of articles to be treated into the inductor rings, and means for rotating the articles to be treated Within each inductor ring.

A still further specific object is to provide an improved conveyor apparatus for delivering articles to be treated to an electromagnetic iield, said conveyor including a plurality of movable trays adapted to support the articles to be treated, and a novel mechanism for removing the treated articles from the conveyor.

Another object is to provide an apparatus for heat treating metal articles, said apparatus including a plurality of inductor rings and means for providing an electromagnetic field within the rings.

A still further object is to provide a heat treating apparatus having a plurality of continually energized inductor rings and a cooling means for cooling said rings during a time interval previous to the delivery of articles to be treated to said rings.

Still another object is to. provide a plurality of inductor rings having means arranged to provide for an electromagnetic field Within said rings and a cooling chamber for cooling each ring prior to the delivery of an article to be treated to said ring, said cooling chamber being displaceable from the ring upon the movement of an article to be treated into said ring.

These and other objects will become more apparent as the description proceeds and upon an examination of the accompanying drawings.

In the drawings:

Fig. 1 is a plan view of a heat treating apparatus.

Fig. 2 is a sectional view showing a plurality of heat treating stations, said View being taken substantially along the line 2 2 of Fig. 1.

Fig. 3 is an enlarged side View of certain heat treating stations, portions of said stations being shown in section, this view being taken substantially along the line 3 3 of Fig. 1.

Fig. 4 is a sectional view through a pre-heating station, said view being taken substantially along the line 4 4 of Fig. l.

Fig. 5 is a detail side view of an actuating mechanism for moving an endless conveyor, said view being taken generally along the line 5 5 of Fig. 1.

Fig. 6 is a detail side view of a portion of the actuating mechanism for the conveyor, said View being taken substantially along the line 6 6 of Fig. 1.

Fig, 7 is a sectional View of an ejecting mechanism for an endless conveyor, said view being taken along the line 1 1 of Fig. 1.

Fig. 8 is a detail View of an actuating mechanism for an ejection device, said View being taken along the line 8 8 of Fig. 7.

Fig. 9 is a detail sectional View of a portion of an ejection mechanism taken along the line 9--9 of Fig. 7.

Fig. 1l)` is a sectional View through the supporting structure of a heat treating apparatus, said view showing a control mechanism and being taken generally along the line IIJ-I U of Fig. 1.

Fig. 1l is a front View of the control mechanism shown in Fig. l0.

Fig. 12 is a sectional view generally taken'along the line I2 I2 of Fig. 10.

Fig. 13 is a schematic View of a quench diagram for a heat treating apparatus.

Fig. 14 is a schematic view of a pneumatic system for a heat treating apparatus.

Fig. 15 is an electrical circuit diagram for theheat treating apparatus.

Referring particularly to Figs. 1 and 2, the reference characters I through I I inclusive relate to -a plurality of heat treating stations which are positioned in horizontally spaced relation. The heat treating stations I to I I are a part of a heat treating apparatus generally indicated by the reference character 20. The heat treating apparatus generally includes housing structures of sheet metal designated by the reference characters 2| and 22. The housing structures 2| and 22 respectively include sheet metal enclosures 23 and 24.

The heating, quenching, and drawingl stations reference character 1 relates to a blow-oli sta-' tion, and stations 8 to I I are the drawing or postheat stations.

In each of the pre-heat stations I to 41and in the draw stations 8 to II an inductor coil or ring 25 is provided. The inductor ring 25, as best shown in Fig. 4, is positioned between a pair of vertically spaced plates 2B which are rigidly secured by brackets 21 to a portion of the housing structure 22; The pre-quench station 5 as best shown in Fig. 3 includes a pre-quench inductor ring 28. Immediately below and in axial alignment with the inductor ring 28 is a quench coil 29.

A quench coil 30 is provided at station 6. It should be noted that stations B and 1 are not equipped with inductor rings. AA blow-off nozzle 3 I is provided at station 1.

The conveyor mechanism The conveyor mechanism is generally referred to by the reference character 35. 'Ihe conveyor mechanism includes an endless conveyor 36 best shown in Figs. l, 2, 3 and 4. The endless conveyor 36 comprises a plurality of inter-connected trays 31. Each tray 31 is provided with a centrally located opening 38 which as best shown in Fig. 4, is peripherally adjacent to an annular shoulder 39. Each tray 31 is also provided with laterally spaced brackets 43 extending outwardlj7 of the trays 31. The brackets 40 are provided for rotatably supporting track wheels 4I. The track Wheels 4I are movable upon endless tracks 42. As best shown in Fig. l, the endless tracks 42 extend in the form of a rectangle, the trays being movable about the rectangle for delivering articles to and from the heat treating stations. 'I'he endless tracks 42 are supported upon horizontally extending channel beams 43 as best shown in Fig. 4, and channel beams 43 as best shown in Fig. 1. Each tray includes a downwardly extending L- shaped guiding' element 44, said guiding element having a portion extending into a recess 45 formed in the endless track 42. As best shown in Fig. 4, a cover plate 46 extends over the outermost track wheel of each tray for retaining the trays on the tracks 42 against vertical displacement.

As best shown in Fig. 4, a gear A is supported on the tray 31. The outer peripheral edge of the gear A rests upon the annular shoulder portion 33, said gear A thus being supported across the center opening 38 of the tray 31. The gear A is of conventional design and includes a hub portion B provided with a center opening C.

As best shown in Figs. 2 and 4 the trays are interconnected by means of an endless chain 41, each tray being suitably connected to the chain links of the chain. The chain 41V is trained around sprockets 48, two of which are provided at each end of the apparatus. The sprockets 48 are freely rotatable about vertical axes on shafts 49.

The indexing mechanism The arrangement of the endless conveyor 36 and the movable trays 31 has just been described. The endless conveyor isV movable-in theA direction of the arrow as best shown in Fig. 1. Each tray 31 is adapted to be placed-into successive vertical alignment with each of the stations I through I I. Thus the gears carried on the conveyor are'also successively placed into vertical alignmentwith each station. In order to move the conveyor so that the gears are thus successively placed in vertical alignment with each station an indexing mechanism is provided. The indexing mechanism is generally referredA to by the reference character 50; As best shown in Figs. l, 2, 5 and 6, the indexing mechanism includes a pneumatic cylinder 5I which is supported on a table 52 connected to one end of the housing structure 2|. A piston rod 53A projects outwardly of the cylinder5I said piston rod including within the cylinder 5I, a piston 54. The piston 54 is adapted to reciprocate within the cylinder 5 I.

A dog 55, as best shown in Fig. 5, is connected to the piston rod 53; The dog 55 is pivoted at 5G on the piston rod 53 for vertical pivotal movement with respect thereto. A leaf spring 51 normally urges the dog 55 upwardly within a recess 58 provided in the piston rod 53. The leaf spring 51 is in contact with an adjustable set screw 59l connected to the dog 55. Each tray 31 is provided with a downwardly projecting dowel pin 6l, and the end of the dog 55 is adapted to engage each pin 60 for moving the trays upon reciproca-tion of the piston rod 53.

.As best shown in Fig. 6, the end of the piston rod 53 is provided with an indexing dog 6I. As will appear'later from the operation, the indexing dog is for the purpose of limiting the travel of the conveyor during the indexing movement provided by the dog 55 so that each tray is successively moved from one station to the other, each tray adjacent each station at all times beingin vertical alignment with said station. The indexing dog 6I is pivotally connected as indicated at 62 to the piston rod 53. A leaf spring B3 is normally in contact with a set screw B4 which in turn is connected to the-dog 6I, whereby the leaf spring 63 normally urges the end of the dog BI upwardly. The dog 6I is provided with a hook portion 65 which is adapted to act as a stop against each pin 60 of each tray 31.

The dog @I further includes a transversely extending pin 66 which is in abutting relation with a horizontally extending plate 61. IThe plate 61 is fixedly secured at each end to a pair of horizontally spaced pins t8. The pins 68 are vertically movable within a pair of spaced bearing members 69 which in turn are secured to one of the channel beams i3. A spring is threaded upon each pin 68 and is positioned between the plate 61 and the bearing member 69. A bearing'plate 1| is rigidly secured to the lower surface of the channel beam 43, the pins 68 extending through said plate 43. The pins E8 are each provided at their lower ends with a head 12. A pair of rocker arms 13 are pivotally connected to the lower surface of the channel beam 43 by means of a downwardly extending plate 14. Each rocker arm 13 is provided with a contact point that is in operative engagement with each head 12 of the vertically movable pins B8. The other end of each rocker arm 13 is provided with a set screw 18 adapted to be engaged by a movable contact element which will be described later.

The spindle carrying mechanism A spindle carrying mechanism is generally indicated by the reference character 80, The

spindle carrying mechanism 80 is best shown in Fig. l and includes a pair of horizontally spaced uprights 8|. The uprights 8| are rigidly connected by means of a lower horizontal channel 82. Each upright is provided with an Lipper track plate 83 and a lower track plate 84. A bridge '85 or support is positioned between the uprights |33 for vertical movement with respect thereto. The bridge 85 includes a pair of transversely spaced vertically movable channels 86 which are rigidly connected to a horizontally eX- tending beam 81. The upper end of each channel 86 is provided with upper track rollers 88 which are arranged to engage and ride upon the upper track plates 83. The lower end of each channel 85 is provided with lower track rollers 80 arranged to ride upon the track plates 84.

The horizontally extending beam 81 is best vshown in Figs. 4 and l and is shaped in the form of a box section. The beam 81 rotatably supports a plurality of spindles or vertical supports generally referred to by the reference character 30. As best shown in Figs. 2 and 3 eleven spindles 90 are provided. Each spindle 00 is in axial alignment with a corresponding heat treating station. Each spindle 90 also includes a circular tip portion 9| which is adapted to be placed into telescoping engagement with the opening C provided in each gear A as best shown in Fig. 4. Each spindle 90 also includes an enlarged collar 92 which is provided at its lower end with a threaded projection 93. The threaded projection 83 is screwed into. as best shown in Fig. 3, a socket 94 which in turn is connected to a driving shaft S5 provided for each spindle. Each driving shaft 95 is in turn journaled within a vertical bearing member 96. Each bearing member 96 is rigidly secured to the horizontally extending beam 81. From this description it can therefore be seen that each spindle is adapted to rotate within each vertical bearing member 96.

The spindle driving mechanism The spindle driving mechanism is best shown in Figs. 2 and 3, said mechanism being generally designated by the reference character |00. As best shown in Figs. 2 and 3, an electric motor 455 is supported on the housing structure 2|. The electric motor 455 is in driving engagement with a gear reduction mechanism |02. The gear reduction mechanism in turn drives a drive shaft |03 which in turn is in telescoping driving engagement with a spline shaft it. The spline shaft |04 is in turn connected to drive a sprocket |05 which in turn drives a chain |05. Each driving shaft 95 (with the exception of the driving shaft at station 5) is provided at its lower end with a sprocket |01. As best shown in Fig. 3, the chain Ille drives a sprocket |08. The sprocket |03 is connected to the driving shaft 95 of the spindle which is in axial alignment with the heat treating station i5. Likewise, the sprocket |05 is connected to the lower end of the driving shaft located in axial alignment with heat treating station 1. Upcn driving movement of the chain |08, therefore, the sprockets IQ'.' at stations Ei and 1 are driven. The rotation of these sprockets 01 thereupon drives a series of chain and sprocket drives |03 which in turn rotates each driving gear |01 connected to each driving shaft S5, thereupon in turn rotating each of the spindles 90 provided at each heat treating station I through l and 5 through II.

The spindle 530 which is in axial alignment with the pre-quench station 5 is driven by means of a gear Il@ which is connected and driven by the shaft $55 of the spindle at station S as best shown in Fig. 3. The gear IIC drives a pair of driven gea-rs |Ii which are pivotally connected within the beam fil. The gears I in turn drive a vertically movable gear II2. The gear I|2 is vertically adjustable within the bearing member 9S and moves with the driving shaft 95 as will be presently described. In view of the vertical length of the gear ||2 the same will at all times remain in mesh with the gear I I I during vertical adjustment of the driving shaft 95.

The bridge raising and lowering mechanism The bridge raising and lowering mechanism is generally designated by the reference character H4, as best shown in Figs. 2 and 3, and includes a stationary pneumatic unit II5. The unit H5' includes a two-way cylinder Il@ which is suitably connected by means of air conduits I ii and IIB. The conduits H1 and IIB are provided for delivering air to the cylinder IIS, thereupon re ciprocating a piston I9. The piston I is is in turn connected to a piston rod |20, the end of which is threaded into a block I2 I. The block |2I is rigidly xed to the lower surface of the beam 81. The pneumatic unit I I5 is stationarily secured to the housing structure 2i and upon reciprocation of the piston rod |20 the bridge 80 is moved upwardly or downwardly.

As best shown in Fig. 3, a pneumatic unit |22 is movably supported on the bridge 81, The pneumatic unit |22 includes a cylinder |23 which is xedly connected to the beam 81. A piston i255 is reciprocable within the cylinder |23 and the piston in turn is connected to a piston rod |25. The piston rod |25 is in turn connected to the driving shaft 5 providedat station 5. Conduits |20 and H21 are in communication with the cylinder |23.

The inductor ring cooling system The inductor ring cooling system is generally referred to by the reference character |30 and is best shown in Figs. 4 and 13. The cooling system is provided at each of the prequench stations I through 4 and at the draw stations 1 through For the purpose of this disclosure Fig. 4 is shown to be typical of these stations.

Referring now to Fig. 4, the cooling system includes a casing I3I. The casing |3I projects into the inductor ring 25 and includes an annular chamber |32. The chamber |32 is adjacent the peripheral inner edge of the inductor ring 25. An upwardly extending neck portion |33 1s connected to the casing |3I. The neck portion |33 is rigidly secured by means of a collar |34 to a rotating sleeve |35. The rotating sleeve |35 is pivoted for rotation within bearing members |36 which are in turn secured within a tubular support |31.

The tubular support |31 is in turn vertically movable within a pair of vertically spaced bearing members |38. The bearing members |39 are in turn rigidly secured to a pair of horizontally extending brackets |39 which are rigidly se cured to a portion |40 of the housing structure 22.

A tubular cap member |4| is connected to the end of the tubular support |31 for .closing the same. A collar |42 is` rigidly xed to the tubular support |31. This icollar is in turn connected to a bracket |43 which supports a collar |44. The collar |44 is secured to a vertical aligning or guide pin |45 ywhich may be reciprocated through an opening |45' in the uppermost bracket |39. The lower end of the guide pin |45 is provided with an enlarged circular portion I-flii which is adapted to reciprocate within an opening |45' provided in the lowermost bracket |99. A sleeve |41 is secured to the lower bracket |39, the sleeve in turn supporting a spring |48 which resiliently holds the tubular support |31 in the position shown in Fig. 4.

An outer tube or conduit |49 is positioned with in the tubular support |31. A tube I 50 is po sitioned within the outer tube |49, said tube |50 being of lesser outside diameter than the inner diameter of the tube |49. The outer tube |49 is sealed at its upper end. as indicated at |5|. The tube |49 is provided at its upper end with an opening |52 which is in communication with a chamber |53 provided in the cap I 4|. The chamber |53 is sealed by -means of a liquid seal |54. The inner tube |50 is also open at its end and is in turn in communication with a chamber |55 provided in the cap |5I. The chamber |55 is sealed from the `chamber |53 by means of a seal |56. A conduit |51 is in communication with the chamber |55, and a conduit |58 is in com munication with the chamber |53. The outer tube |49 is in communication with a bore |59 which is provided in a lower portion of the rotating sleeve |35. The bore |59 is in communication with an annular recess |60 provided in the upper end of the collar |33. The chamber |60 is in turn in communication with a vertical bore |6| which is connected to a branch conduit |62. The branch conduit |62 is in turn in communication with the chamber |32.

The conduit |50 is at its lower end in communication with a transverse bore |63 formed in the neck portion |33. The bore |63 is in turn in communication `with a branch conduit in communication with the chamber |32.

The gear effecting mechanism The gear ejecting mechanism is referred to by Vthe reference character |10 as best shown in Figs. 1, 7, 8 and 9. As best shown in Fig. 7, a. vertically movable shaft |12 is positioned between the spaced horizontally extending channels 43'. The channels 43 extend in the same horizontatl plane as the channels 43 previously described. The shaft |12 includes at its upper end a circular tip portion |13 and a collar |14. The tip |13 is similar to the tip 9| of the spindle and is for the purpose of joining in telescoping relation with the openings C of the gears A. The shaft |12 is vertically adjustable within a. bearing sleeve |15 which is connected to a plate |15 connected across the lower surfaces of the channels 43. The lower end of the shaft |12 has pivoted thereon a cam roller |16. The cam roller |16 is adapted to roll :within a helical track |11 provided in a cam |88. The cam |88 is positioned within a housing I 89 which is supported by the lower portions of the channels 43.

The cam |88 is rigidly xed to a. shaft |90, the shaft |90 being positioned within a bearing 19| rigidly secured to the housing |89. A second bearing I9 is supported by a bracket |89 which extends downwardly from the plate |15. The shaft |90 is rotatable within the bearings |8| and I9 I and is provided at its extreme end with a pinion |92 in turn meshing with a pinion |93 which in turn is rigidly xed to a vertically extending shaft |94. The shaft |94 is journalled for rotation within a bearing |94 lwhich is rigidly secured to the housing |89.

An eiecting arm |95 is rigidly secured to the upper end of the shaft |94. As best shown in Fig. l the ejecting arm |95 is provided with an arcuate slot |96, the purpose of which will appear later. A stationary stop |91 is connected to a portion of the housing 2|, said stop having a surface substantially in vertical alignment with the arcuate slot |96.

The shaft |90 is driven by means of a sprocket |98 which is in turn driven by a drive chain |99 from a sprocket 200. The sprocket 200 is in turn rotated by means of a universal drive shaft 20| which is driven by means of a stub shaft 20| journalled within a bearing bracket 202 which is rigidly secured to one of the channels 43. The stub shaft 20| has connected for driving engagement therewith a gear 203 'which in turn meshes with a gear 204 driven by means of a stub shaft 205. The stub shaft 205 in turn extends through a bearing 206, an integral part of the bearing 202. As best shown in Fig. 8 the gear 204 is in meshing engagement with the teeth of a rack 201. The rack 201 is in turn connected to the beam 81 of the bridge 85.

The quench and cooling system diagram The quench and cooling system is best shown in the schematic diagram of Fig. 13. This system consists essentially of a main cooling fluid inlet line 2 I0. A shut-off valve 2 II is provided at one end of the line for suitably regulating the flow of fluid thereto. A branch inlet conduit 2|2 extends to each of the conduits |51 of the casings |3| provided at stations I to 4 inclusive. A branch outlet conduit 2|3 extends from the conduits |58 of the casings I 3| back to a main outlet conduit 2 I4.

Branch inlet conduits 2|5 extend from the main conduit 2I0 to each of the conduits |51 of the casings |3| provided at the draw stations from 8 to respectively. Branch drain conduits 2|5 extend from the conduits |58 of the casings I3| to the main outlet conduit 2| 4. A quench branch conduit 2|9 extends from the quench ring 30 to a quench fluid conduit 2|1. A shutoff valve 2|9 is provided in this system. The conduit 2|1 is also in communication with a quench water conduit 22| which extends t0 the quench coil 29 at station 5. A pneumatic gate valve 220 is provided between the conduits 22| and 2|1. A regulating valve 222 is provided at the end of the system 2|1 for regulating the same.

.Fhe pneumatic circuit diagram As best shown in Fig. 14 the pneumatic circuit consists essentially of an air reservoir 230. The air reservoir includes a main conduit 23|. A branch conduit 232 extends from the main conduit 23| to a magnetically operated four-way valve 233. The valve 233 is adapted t place the conduit 232 into communication with the conduit |26 which leads to one end of the pneumatic unit |22 for regulating the pneumaticl cylinder |23 at station 5. As has previously been described, this cylinder is a two-way type and the conduit |21 is also adapted to be placed into communication with the conduit 232 by means of the valve 233. An exhaust conduit 235 is also in communication with the valve 233.

A conduit 238 is also in communication with the conduit 23| and the conduit 236 is in communication with a cam actuated valve 231. The cam actuated valve 231 is adapted to be operated by a cam 238, the operation of which will be described later. The conduit ||1 is adapted to be placed in communication with the conduit 236 by means of the valve 231, the conduit ||1 being connected to one end of the pneumatic unit l5. The unit has been previously described as functioning to raise and lower the bridge 85. The pneumatic unit I5 is also of a two-way type and the conduit HB is adapted to be placed into communication with the conduit 238 by means of the valve 231. An exhaust conduit 24| is adapted to be regulated by the valve 231.

A conduit 242 is in communication with the main conduit 23|, the conduit 242 being controlled by a four-way cam actuated valve 243. The valve 243 is moved by means of the cam 238, said cam being drawn twice for diagrammatic purposes. A conduit 245 may be placed into communication with the conduit 242 by means of the valve 243, said conduit 245 leading to one end of the cylinder 5| which is provided to actuate the indexing mechanism 50 as previously described. The cylinder 5| is of a two-way type and a conduit 245' is adapted to be placed into communication with the conduit 242 by means of the valve 243. An exhaust conduit 246 is also in communication with the valve 243.

A conduit 241 is in communication with the conduit 23|. The conduit 241 is provided at one end with a magnetically operated four-way valve 248. A conduit 249 is adapted to be placed into communication with the conduit 241 by means of the valve 248. The conduit 249 is in turn in communication with a pneumatically operated gate valve 220 also shown in the quench and cooling system of Fig. 13. The valve 220 as previously mentioned is provided for the purpose of regulating the quench fluid from the conduit 2 |1 to the quench coil 29 of station 5. The cylinder of the pneumatic gate valve 220 is of a two-way type and is provided with a conduit 250 which may be placed into communication with the conduit 241 by means of the valve 248. A conduit is in communication with a cylinder 252 operable to actuate a valve 253, which in turn con- 10 trols the air iiow through the blow-off nozzle 3| of Fig, 3. An exhaust conduit 254 is arranged to be placed into communication with the valve 248.

Operation The gear handling apparatus which is disclosed is particularly suitable for the heat treating of objects of irregular contour such as the gears A which are supported on each of the trays of the conveyor. It must be understood, however, that any type of article may be hardened by this apparatus the same is not confined merely to the hardening of gears. The Kincaid et al. application which has previously been mentioned sets forth a novel process for treating gears, The treatment of the gears in this process consists of subjecting the articles to treatment at a plurality of stations, the articles thereupon being successively indexed from one station to the other until the predetermined surface hardening of the gear is effected. The gears are first indexed through the four pre-heating stations 2, 3 and 4. At each of these four stations the gear is subjected to an electro-magnetic eld of audio frequency, preferably between the limits of 960 to 9,600 cycles.

The eld at each station is produced by the inductor blocks or rings 25 which are energized from audio frequency generators. The time interval to which the gear is subjected at the field is so related to the time it is indexed that after being heated at the four stations the gear has a temperature near the point of 900o F., this temperature being substantially below the transformation temperature of steel.

After the gear has been indexed to the fourth station, it then passes on to the fifth, where a heat and quench operation is effected. At this station the contour hardening of the gear takes place. The inductor block 28 is energized from a radio frequency generator having a frequency between 90,000 and 450,000 cycles. Accordingly, the gear at this station is subjected to a radio frequency electromagnetic field. The duration of the radio frequency heating is substantially shorter than the duration cf the pre-heating and the process is effective t0 heat the gear over a shallow band extending along the contour of the teeth of the gear. After the gear has been subjected to the radio frequency field, it is then lowered into the quench coil 29.

At this time a quenching fluid (preferably of water or oil) is projected on the gear 20. The quenching fluid thereupon partially quenches the gear. The gear is thereupon indexed to station 6, where it again is subjected to a quenching fluid from the quench ring 30. The gear is now properly quenched and suitably hardened.

From station 5 the gear is indexed to station 1 where the blow-off nozzle 3| is effective to blow ofi any excess particles of water or quenching fluid that might remain on the gear.`

The gear is now indexed from stations 8 through whereupon it again enters into an audio frequency electromagnetic field at each of the inductor blocks 25. The elds are applied for the same duration as the preheatng elds and operate to reheat the gears to approximately 350 F. The gears are thereupon drawn and moved out of station Il, where they are subsequently ejected from the conveyor. The heat treating cycle through which each gear must pass has thus been described. The operation of aes'asoi 1l the novel mechanism for indexing each gear through the cycle will now be described.

Since the apparatus is almost completely automatic only one operator is required. The operator stands at the front of the machine and places the gears to be treated on the trays 31 of the conveyor. For the purpose of discussing the operation it will be assumed that a gear is positioned at each of the eleven stations. With this assumption then the gear positioned at station is ready to be moved from the station and subsequently discharged as a fully treated article. Therefore, the next step in the operation of the machine is to index or move the conveyor, thereupon in turn advancing each unfinished gear one more station. The piston 53 thereupon moves toward the left when viewed in connection with Fig. 6. As the piston reciprocates the dog 55 engages the pin 60 of one of the trays and moves the trays along the endless tracks 42.

As the piston 53 thus moves to advance the trays 31 the hook portion E5 of the indexing dog 6I remains in contact with one of the pins 00 as shown in Fig. 6. The indexing dog 65 serves to restrain the conveyor from rolling beyond the point desired by its own inertia. At each stroke or movement of the piston arm 53 each tray is moved a distance equivalent to the distance between each station. The trays, as they pass underneath the stations, must be in direct axial alignment with the inductor ring of each station and the novel indexing mechanism and specifically the indexing dog serves to move the conveyor evenly so that each tray is accurately moved one station and remains in this position until subsequent actuation of the piston arm 53. The gears on the conveyor have now advanced one station and they are prepared for the next treating operation.

The pneumatic unit I I is thereupon placed into actuation and the piston rod |20 is moved upwardly. The bridge in turn also moves upwardly. As previously described, the spindles 90 are carried on this bridge and they are thus moved upwardly. All the spindles are rotated by means of the driving mechanism previously described. As has previously been indicated the spline |04 is in telescoping arrangement with the drive shaft |03 and thus as the bridge 85 is moved upwardly the spline |04 moves relative to the gear reduction mechanism |02, but is maintained in driving relation. Thus the spindles 90 are all rotating.

Thus, continued upward movement of the bridge 85 is effective to place the spindles 90 into engagement with the gears supported on the conveyor mechanism. The circular tip portion 9| of each spindle is moved into mating engagement with the hub portion of each gear and as the bridge 85 is moved upwardly the gears are moved upwardly from the trays 31. Continued upward movement of the lbridge 85 causes the gears to be moved into the inductor coils 25 and the quench ring 30. At stations I to 4.and 8 to II inclusive, the movement of the gear into the inductor ring 25 is effective to displace the cooling casing |31, the operation of which will be described later.

It is, of course, apparent that the inductor ring 28 at station 5 is in a higher horizontal plane than the inductor rings 25, thus the gear must be raised higher at this station. As the bridge 85 is moving upwardly the pneumatic unit |22 is effective to move the driving shaft 95 at this station upwardly. In View of the vertical extent of the gear |I2 the driving shaft continues to be driven by the gears thereupon rotating the spindle 90 at this station. When the bridge has moved to its maximum upward position the spindle at station 5 has also moved vertically with respect to the bridge 85, thereupon in turn moving the gearl at this station into the radio frequency inductor ring 28. While the remainder of the gears are thus under treatment at stations I to 4 and 6 to the gear at station 5 is thus subjected to the radio frequency electromagnetic field. Before the bridge 85 is lowered, the pneumatic unit |22 is effective to lower the gear in station 5 into the quench coil 29, whereupon quenching takes place.

After this operation the unit ||5 is again effective to lower the bridge to its normal position. As the spindles 9.0 are thereupon lowered, the gears at each station are again brought to rest upon the trays 31 and the conveyor is ready for indexing movement for moving the gears to the subsequent station.

With reference now to Figs. 5 and 6, the mechanism disclosed therein will be described. As previously mentioned, the first step is to index the conveyor, whereupon the trays are moved to a succeeding station. Before the piston rod 53 can be withdrawn into the cylinder 5| prior to its next pushing movement, it is necessary to disengage the dog 55 from one of the pins B0. In order to accomplish this, it is necessary to push the dog 'E5 downwardly about its pivotal point 62 and against the action of the leaf spring 63. A stop 26e connected to the bridge 85 is provided for this purpose. As the bridge 85 moves upwardly to remove the gears from the conveyor, the stop moves into engagement with the set screw 16 of the rocker arm 13. Continued upward movement of the stop 260 causes the rocker arm `13 to force the sliding pins 68 downwardly. As the pins 68 are moved downwardly against the pressure of the spring 10, the plate 61 is also forced downwardly. As the plate 61 is pushed downwardly it, in turn, reacts to push downwardly on the pin 65, thereupon moving the dog 65 downwardly out of engagement with the pin 60 of one of the trays 31. At this point the piston rod 53 is withdrawn into the cylinder 5|. Upon this movement of the piston rod 53 the dog 55 is designed to pivot downwardly against the action of the leaf spring 58 upon engagement of the dog with any of the pins of the trays without effecting the position of the conveyor.

As the trays 31 are thus indexed from station to station, the finished gears move from station |I to a position whereupon they are in vertical alignment with a vertically movable shaft |12 of the gear ejecting mechanism |10. Upon each movement of the bridge 85 upwardly the rack 201 functions to rotate the gear 204, thereupon effecting movement of the gear 263. As the gear 203 is rotated the universal drive shaft 20| is effective to rotate sprocket 200, this, in turn, actuating the chain |99 and thereupon rotating the shaft |90. As the shaft |90 is thus rotated the cam |18 is also rotated. The cam roller I 16 of the shaft |12 in its normal position at the innermost point of the helical track |11. As the cam |18 is rotated the roller |16 rolls Within the track |11 to the highest position on the cam |18, said highest position being at the outer end of the helical track |11. As this occurs, the shaft |12 is moved upwardly, whereupon the tip |13 of the shaft is moved through the opening 38 of the tray 31 positioned immediately above and in axial alignment with the shaft |12. The tip |13 engages the hub portion B of the gear A and lifts the same upwardly off of the tray 31. The gear is thus positioned slightly above the ejecting arm |95. Simultaneously with the movement of the cam |18 the pinions |92 and |93 are effective to rotate the shaft |94. As the shaft |94 is thus rotated the ejecting arm |95 is rotated about its vertical axis in a counter-clockwise manner, the slot |96 thereupon completely encircling the shaft |12. In this position the gear is a slight distance above the ejecting arm |95.

As the bridge 85 is thereupon lowered thev universal drive shaft 29| works in reverse, thereby in turn reversing the operation of the cam |18 and the ejecting arm |95. Immediately upon lowering of the shaft |12 the gear which has been supported on this shaft is deposited on the ejecting arm |95. Continued lowering of the bridge causes the ejecting arm |95 to move in a clockwise manner into the position shown in Fig. 1. As the ejecting arm moves into position the gear engages the stop |91 and is thereupon pushed from the ejecting arm |95 into a discharge trough 26|. Thus it can be seen that upon each indexing of the trays from one station to the other and upon a raising and lowering of the bridge one gear is removed from the conveyor.

In stations I to 4 and 8 to a cooling system is provided for each of the inductor coils 25. During the operation of the machine it is desirn able that the inductor coils are continually energized so that an electromagnetic eld is continually present. It can readily be seen that it is therefore desirable to provide a cooling means whereby the unloaded energized inductor rings can be cooled in an unloaded condition. rIhe cooling system is best shown in Fig. 4. A cooling fluid continually passes from the conduit |51 into inner tube |50, whereupon the cooling liquid flows through the conduit |64 into the annular cooling chamber |32. The casing |3| is within the inductor ring 25 and thus is within the electromagnetic fleld provided by the ring. For the purpose of this application and the discussion of the operation of the mechanism |30 has been termed a cooling mechanism. It may be more accurate to term this mechanism as a dummy load arrangement since it is similarly effective to take the place of a gear prior to the delivery of the same into the inductor ring.

The liquid ows from the chamber |32 into the conduit |62 through the bore |59 intothe space formed between the outer edge of the inner tube |50 and the inner peripheral surface of the outer tube |49. The liquid flows through the opening |52 into the chamber |53 and outwardly through the conduit |58.

During the unloaded position of the inductor coil 25 the casing |3| is in the position shown in Fig. 4. As the bridge 65 moves upwardly and the gears A are moved into the inductor rings 25, the gear A engages the lower portion of the casing |3|. Continued upward movement of the gear causes the complete displacement of the casing |3| from the inductor ring 25. The casing |3| continues to rest upon the upper edge of the gear which has displaced the casing. The gear A rotates the casing |3 The rotating sleeve |35 and the inner and outer tubes |49 and |50 continue to rotate with respect to the tubular support |31. The vertical pin is eective to keep the tubular support |31 in vertical alignment with the inductor rings 25. As the bridge 85 again lowers and the gear A is withdrawn 14 from within the ring 25 the casing |3| and tubu` lar support |31 again move downwardly whereupon the cooling chamber is once again within the ring 25.

As best shown in Fig. 3, stations 5, 6 and 1 are provided with a rubber receptacle 265. At these stations the quench and blowoff of the quenching fluid is effected and the same flows into the receptacle 265. A spout 266 funnels the uid down into a drain tank 261.

The electrical operation The electrical circuit diagram for the system is shown in Fig. l5. The operation of the system is initiated by closing a manually actuable start switch 40|. AActuation of this switch closes a circuit extending from a hot terminal 403 of a power supply (not shown) through the switch 40|, the exciting coil 405 of a main control relay to ground. This relay is now actuated closing a circuit through a coil 401 for actuating contactors 409 and 4| I which close the supply circuits through the preheat and postheat low frequency generators 4|3 and 4|5, respectively. The latter are preferably of the motor-generator-set type although they may be of the electronic type.

The closure of the start switch 45| also closes a circuit from the terminal 403 through the switch, the exciting coil 4|1 of an initiating relay to ground. This initiating relay is now actuated initiating the operation of the various components of the system.

The actuation of a start switch also closes a circuit extending from the terminal 403 through an intermediate fixed contact 4|9 of the switch, the exciting coil 42| of a lock-in relay to ground. This lock-in relay picks up and closes a circuit from a hot terminal 423 of the supply through its contactor 42 5, the exciting coil 421 of a second lock-in relay to ground. Through a contactor 429 of the latter lock-in relay (421) and through one of its own contactors 43| the initiating relay (4|1) is locked in.

The switch 40| may now be released. With the switch released the first lock-in relay (42|) remains energized in a circuit extending from Aa hot terminal 433 of the supply through a normally closed cam actuated switch 435, the exciting coil 42| of the relay to ground.

When the initiating relay (4|1) is actuated, a

circuit is closed through the coil 431 for ac-v tuating the cam-motor contactor 439 which extends from a hot terminal 44| through a stop button 443, a now closed contactor 445 of the initiating relay, the exciting coil 431 to ground. The circuit through the cam motor 441 is now closed and locked in through a contactor 449 of the cam-motor relay (431). Another circuit is also closed through the coil 45| for actuating the contactor 453 for the spindle motor 455. This circuit extends from a hot terminal 451 of the supply through another stop button 459, another now closed contactor 46| of the initiating relay (4H), the exciting coil 45| of the spindle motor contactor to ground. The spindle motor 455 is now energized and the spindles are rotated. The spindle motor contactor 453 is locked in through another contactor 463 of the relay (45|).

The operation of the cam motor 441 causes the cam 238 to rotate to and actuate the bridge-lift valve 231. Fluid is injected into cylinder ||5 and the spindle bridge is lifted. The spindles engage any gears that happen to be disposed aesasoi 15 on the trays 31 with which they are coaxial and raise the gears into the coils at stations l, 2, 3 and 4, 'the quench rings at stations =5 and 'E yand the coils at stations 8 to Il. The gears 'engage the casings |32 and r-aise the supports |31 as previously mentioned.

Each of these tubes of supports `|131 carries a cam 41| for actuating the contact 413 of a switch which is open when the bridge is in the lowered position. When the tubes |31 are raised by the operation of the bridge, these switches (413) are closed. A switch (413) is thus closed at each position at which the spindle engages and raises a gear. These switches are connected in parallel with the cam operated switch 435 and maintain the circuit through the exciting coil of the lockin relay (42|) closed when the cam operated switch 435 is opened by the cam 415. Just after the bridge 55 is raised, the cam 415 rotates to a position at which it opens the switch 435 for a short time interval. If there are no gears -on any of the spindles 90 raised by the bridge at this time, the circuit through the exciting coil 42| of the rst lock-in relay is opened and this lock-in relay drops out. However', the second lock-in relay (421) which shunts out the start switch 40| at this time remains pulled up through a second cam actuated switch 411. The circuit through this latter cam actuated `switch extends from a hot terminal 419 of the supply through. the switch 411, the exciting coil 421 of the relay to ground. In the absence of gears on any of the spindles 90, the rst lock-in relay (42|) ac cordingly opens but `does not at -once cause the circuit through the start switch lock-in relay (421) to open. The cam motor 441 continues to operate and the valve 231 passes through a cycle during which it lowers the bridge 85 to its initial position. Shortly after the bridge is lowered to its initial position the second cam actuated switch 417| opens, opening the `circuit through the `exciting coil 421 of the start switch lock-in relay. Since the switch 40| is now open, the initiating relay (4|'1) is yde-energized and the operation of the system is stopped.

If, when the bridge 85 is raised, the spindles 90 carry yone or more the corresponding spindle limit switches 413 are closed when the rst cam actuated switch 435 is open Iand the lock-in relay (42|), and with it the start switch lock-in relay (421.), both remain energized. When the bridge 85 arrives at its upper position it closes a bridge limit switch 493. The latter closes a circuit extending from a "hot terminal 493 of the power supply through a neu7 closed contacter 495 of the initiating relay (451), a normally closed contactor 491 ci an auxiliary relay 4'99, a bridge limit switch 49|, the solenoid v55| for valve 233 to ground. Valve 233 is now 'operated and a gear, if any is present on the spindle at station V5, is raised into the heating ring 23 at this station. A limit switch 553 is closed when the spindle 'at station 5 rises to its uppermost position closing a circuit which lextends from a het terminal 505 or the power supply through 'this limit switch, a now closed contacter 501 of the initiating relay (lill), the exciting `coil 559 of a relay which is slow to pick up to ground. The latter relay (509) remains in its initial position for a short time interval and a circuit is closed through its contactor 51| and through the exciting coil 513 oi a timer relay. The timer relay (513) now picks up, closing at one lof its `contact'ors 5|'5 'a circuit through the oper-ating 'coil oi a counter 5|1 which indicates 4that one treatment 75 is in process. At its other -contacter 519 'the timer relay closes -a circuit through the initiating mechanisms (not shown) of a timer 52|.. This timer is preferably electronic 'and includes timing components (not shown) which may be of the usual capacity-resistor network type and a plurality of pairs ci contacts 523, 5215 and 521 respectively. Oi 'these contacts, 523 vand 525 are closed immediately aliter the timer relay (-513) is actuated; the other 521 is 4closed when the timing period for the timer i521 expires.

Timers which would serve the purposes of lour invention are available in large numbers in the art. A 4representative type is shown in `a copen'ding application, Serial No. 16,3850, liiled March '24, 1948, to Edward C. Hartwig, Whichhas now lissued as U. 1S. .Patent No. 2,533,318, and assigned to the Westinghouse Electric Corporation. The Hartwig timer is designed to perfor-m a larger number Aof functions than is involved here but can be modified 5to satisfy the present purposes. At the now closed `contact 525, the timer relay (533) is locked in. At the now closed contact 523, a circuit is closed throughthe exciting coil 52S of a lcontacter for the contour heater 53|. This lcontacter (57.9) is now closed, energizing the high frequency contour heater, Aand any gea-r disposed in the hea-ter ring 23 is heated by induction.

While the timer 52| is passing through'its timing operation, the sluggish relay '(509) operates. The timer lrelay `(5|3), however, remains energized. The actuation of the sluggish relay '(509) precludes Aa second actuation of the timer relay (553) once the timing operation is 'complete-d and the timer relay is de-energized When the timer 52| completes one phase of its operation, the contact 523 is opened, opening the `contour heater circuit. The 'contact 525 opens, resetting timer relay (SIB). The other contact 521 `closes 'at the Aend of the iirst phase of the operation and remains closed.

When contact 521 closes, it closes a circuit extending irom Va hot terminal 533 of the lsupply through the contacts, `a normally closed conta'ctor 535 of 'a terminating relay 531, the exciting coil of the auxiliary relay 459 to ground. 'The latter relay '(499) is actuated, opening the circuit through the solenoid 50| of the valve l233. The .gear at station 5 is now dropped `by the spin die to 'the quench ring 29 at the ylevel of rthe other gears.

'Through now closed contacter 521 .the initiating circuit for the quench timer 54| is also closed. The quench timer 54| may also `be or" the Velectronic type. A predetermined time after the closing of the contact 521, the con-tact 543 .of the quench timer opens. This `contact remains open until the timer :541| begins a ysucceeding timing opera-tion. The circuit is now opened from a hot terminal V545 through the exciting coil'541 of the -quench Vrelayto ground. The lquench relay (541) drops out, closing `a circuit through :a normally closed contacter 549 of the terminating relay 521 and the solenoid 55| :for valve 148. Valve 248 operates, releasing quenching 4flu-id and air for :blowing off 4any gear at station 1.

While these events are taking place the .cam4

motor 441 continues to rotate. -Evenutallfly cam 23B reaches a position at `which the valve 231-opcrates. The ilu-id vfrom cylinder JI 1|5 is how exhausted :and bridge v55 begins Ito drop, .opening the limit switch 49|.

Before the bridge has dropped substantially, a cam switch 56| is closed momentarily. A circuit is then closed which extends from a hot terminal of the supply through the cam switch 561, a conductor, the exciting coil oi the terminating relay 53's to ground, rlhis relay is immediately actuated and is locked in through one of its closed contactors 565 the now closed contacter 55'@ of the quench relay (titi). At one of its now open contactors site, the termination relay 53'! opens the circuit or the solenoid 55l for Valve 243. This valve operates exhausting the cylinder 22d and stopping the flow of quench liquid and air. At another now open contacter 535, the circuit through the exciting coil of the auxiliary relay it is opened and the latter resets for another operation. Since the bridge limit switch 4S! is new open, the solenoid 50| remains currentless.

The bridge 85 now drops to its initial position. The cam 2353 continues to rotate eventualiy ciosing valve 253. Rod 53 is now actuated, advancing the gears each to the succeeding station. The system is now in a condition for a repeat operation.

During the succeeding operation contact 521 opens when the timer 52| is initially actuated on actuation of the timer relay (5&3). When contact 521 opens quench timer bei resets. The quench relay (5M) is now actuated opening its contact 56? and resetting the terminating relay 531.

Our system is designed for high speed operation. A typical period for a complete cycle is of the order of ve to seven seconds. The RF timer has a time period of the order oi .7 o a second. rThe quench relay, that is the time interval between the termination of the RF heating operation and the initiation of the quench operation, is of the order of .3 of a second. A gear deposited on a tray t? passes through the machine and is discharged in a time interval oi the order of one minute after it is deposited.

It can now be-seen that a novel heat treating apparatus has been provided which will fully accomplish the desired objects of the invention. It must be understood, of course, that changes and variations may be made which do not depart from the spirit of the invention as disclosed nor the scope thereof as defined in the appended claims.

What is claimed is:

l. An apparatus for heat treating an article comprising a plurality of horizontally spaced pre-heat stations, a pre-quench station, each of said stations including an inductor ring, said rings being positioned in horizontally spaced relation, an endless carrier for movably supporting articles to be heat treated, said carrier including a plurality of trays, means for moving each tray successively into axial alignment with e ch inductor ring, means for moving the articles 'from said carrier including a pair of horizontally spaced upright members, a vertical traclr on each member, a bridge vertically movable between said upright members, said bridge including a pair of horizontally spaced vertical supports having bearing means engaging said tracks, a horizontal beam connecting said vertical supports, a plurality of rotatable spindles mounted on said horizontal beam and in axial alignment with said inductor rings, means for rotating said spindles, and means constructed and arranged to vertically move said bridge, said spndles thereupon engaging the articles on said carrier and thereby moving the same into said inductor rings.

2. An apparatus for heat treating an article comprising a plurality of horizontally spaced preheat stations, means for producing an alternating electromagnetic field of a first frequency at said pre-heat stations, a pre-quench station, means for producing an alternating electromagnetic eld of a substantially higher frequency than said iirst frequency at said pre-quench station, an endless carrier for movably supporting articles to be heat-treated, said carrier including a plurality of trays having centrally located openings, means for supporting the articles to be treated on said trays, means for indexing said trays to successively move each tray from one station to the other, means for moving the articles to be treated from said carrier into the electromagnetic nelds including, a pair of horizontally spaced upright members, a bridge vertically movable between said upright members, said bridge including a pair ci horizontally spaced vertical supports engaging said upright-s for movement with respect thereto, a horizontal beam connecting said vertical supports, a plurality of spindles mounted on said beam, said spindles being in axial alignment with said stations, means for rotating said spindles, and means constructed and arranged to bodily move said bridge, said spindles thereupon moving through the openings of said trays thereby removing the articles to be treated and moving the same into the electromagnetic elds of said stations.

3. An apparatus for heat treating an article comprising a plurality of horizontally spaced stations, means ior producing an alternating electromagnetic field at said stations, a carrier for movably supporting articles to be heat treated,

said carrier including a plurality of trays having openings, means for supporting the articles to be treated on said trays, means for indexing said trays to successively move each tray from one vstation to the other, means for moving the articles to be treated from said carrier into the electromagnetic field including, a pair or" horizontally spaced upright members, a bridge vertically movable between said upright members, said bridge including a pair of horizontally spaced vertical supports engaging said uprights for movement with respect thereto, a horizontal beam connecting said vertical supports, a plurality of spindles mounted on said beam, said spindles being in axial alignment with said stations, means for rotating said spindles, and means constructed and arranged to bodily move said bridge, said spindles thereupon moving through the openings of said trays thereby removing the articles to be treated and moving the saine into the electromagnetic fields of said stations.

e. An apparatus for heat treating an article comprising a plurality of horizontally spaced stations, means for producing an alternating electromagnetic neld of a iirst frequency at said stations, a plurality of movable trays having openings therein, means ior supporting the articles to be treated on said trays, means for indexing said trays to successively move each tray from one station to the other, means for moving the articles to be treated from the trays into the electromagnetic nelds including, a pair of horizontally spaced upright members, a bridge vertically movable between said upright members with respect thereto, a plurality of spindles mounted on said bridge, said spindles being in axial alignment with said stations, means for rotating said acca-sofi spindles, and means :constructed and arranged to bodily move said bridge, said :spindles thereupon moving through the openings of said trays v.for engaging the articles to be treated and moving the same into the electromagnetic iields 4of ksaid stations.

v5. An apparatus -for heat treating .an `article comprising a plurality oi heat treating stations, means for producing an electromagnetic field at stations, kmeans for handling the articles to lbe treated, `said means including a bridge, means :for supporting articles to .be treated on said bridge, means for raising and lowering :said bridge thereby `moving `the articles .to be treated into and out of the :electromagnetic heide, :and i conveyor means .constructed and arranged for moving each article to be treated lto .successive different positions on said bridge whereby each article is successively moved into and .out of the held at Veach station.

6. An apparatus rfor heat treating an article comprising a plurality of heat treating stations, means Ifor producing an .electromagnetic field at said stations, means for handling the articles to be treated, said mcans including a horizontally extending member, means for supporting -articles to be treated on said horizontally extending member, means for raising and lowering said horizontally extending member thereby moving the articles to be treated into and out of the electromagnetic elds, and conveyor means supported on said horizontally extending member, said conveyor including indexing means constructed and arranged for moving each article 'to be treated to successive diierent positions on said horizontally extending member whereby each article is successively moved into and out of the eld at each station upon each raising and lowering of said horizontally extending member.

'7. An apparatus for heat treating metal artcles comprising a plurality of inductor rings, means for handling articles to be treated `including an article supporting means, said supporting means vertically movable to move articles into and out of heat treating relation with respect ing means whereby each article is successively moved into and out of heat treating relation with respect to each inductor ring upon successive vertical actuation of said supporting means.

8. An apparatus for heat treating metal articles, said apparatus having a plurality of heat treating stations, an endless carrier for delivering articles to be heated to the stations, said carrier including a plurality of trays having centrallv located openings over which the articles dies, means for moving said spindles vertically through the openings in said trays thereby moving the articles to be treated into said heat treating stations, said spindles being thereupon operable for returning the articles to said trays, means for moving the carrier for successively moving each tra?,1 from one station to the other, means for ejecting the treated gears from said trays, said means including an ejection spindle, means for moving said ejecting spindle vertically through each tray thereupon lifting the article thereon above said tray, a rotatable ejection arm constructed and arranged to engage the treated article upon lowering of said ejection spindle,

`20 and `means for vmoving said ejection arm to keject the treated .article therefrom.

`9. An 'apparatus for `heat treating a .metal `article including an inductor ring, Ameans for producing an electromagnetic field within the nductor ring, means for cool-ing said inductor ring comprising a casing having Aan annular chamber, said chamber being positioned within said inductor ring `adjacent the inner peripheral surface of the same, a tubular support, means rotatably connecting said casing to Asaid tubular support, .uid inlet and fluid outlet conduits positioned Within said tubular support and in communication vWith said annular chamber, a ca'rrier 'for delivering articles to be treated adjacent to said inductcr ring, means for removing 'the articles from said carrier, said means including a rotatable spindle, means for moving vsaid :spindle into engagement with the articles to be treated thereby moving the articles from the :carrier into `the inductor ring, ,the article to be treated thereby engaging said casing and axially moving the same out of the inductor ring, and means for rotating said spindle 'and the article to be treated within said inductor ring, said casing being movable into lsaid ring upon the removal of the article from said ring.

1-0. An apparatus for heat treating a metal article including an inductor ring, means for producing an electromagnetic eld Within the inductor ring, means for cooling said -ring 4comprising a casing having an annular chamber positioned Within the inductor ring, a support for movably supporting said casing and the chamber Within said ring, conduit means for circulating a huid through said chamber, a carrier for delivering articles to be treated adjacent to said ring, a rotating member operable `for carrying the articles to be treated from said carrier, means for rotating said rotating member and the article to be treated, means constructed and arranged for moving the article to be treated into said electromagnetic field and means simultaneously engageable with said cooling chamber for moving said cooling chamber from said inductor ring.

11. An apparatus for treating a vmetal article including an inductor having an inner peripheral surface for encircling the article to be treated, means for producing an electromagnetic iield in the inductor, means for cooling the inductor previous to the delivery of an article to be treated to said electromagnetic field, said means including a cooling chamber positioned adjacent the inner peripheral surface of the inductor conduit, means communicating with said chamber for supplying iiuid to said chamber, and movable means for delivering an article to be treated to said field, said last mentioned means being constructed and arranged to engage and displace said chamber from said inductor.

12. An apparatus for treating a metal article, including an inductor having an inner peripheral surface for encircling the article to be treated, means for producing an electromag- 1 netic field in the inductor, means for cooling the inductor previous to the delivery of an article to be treated to said inductor, said means including a movable cooling chamber arranged Within the inductor, fluid conduits communicating with said chamber, a spindle in axial alignment with said inductor, means for supporting the article to be treated on said spindle, and means constructed and arranged for moving said spindle axially thereby moving the article to be treated into the inductor, said article engaging said cooling chamvber whereby the cooling chamber is simultaneously moved out of said inductor.

HOMER F. KINCAID. JOHN D. GRAHAM. DELOSI J. REYNOLDS. EDWARD M. WHARFF.

References Cited in the file of this patent UNITED STATES PATENTS Number Borchert June 13, 1933 Number 22 Name Date Reid July 6, 1937 Denneen et a1 Apr. 21, 1942 Somes June 30, 1942 Davis May 11, 1943 Stewart May 11, 1943 Stewart June 20, 1944 Somes Nov. 26, 1946 Denneen et a1 Nov. 4, 1947 Jordan June 29, 1948 Cox Nov. 16, 1948 Lee Dec. 21, 1948 Vore Dec. 28, 1948 Storm Mar. 15, 1949 Jagen Apr. 18, 1950 Journeaux May 2, 1950 Kincaid Aug. 21, 1951 

